What article? I've have a pile of their magazines sitting on my floor at home. I could scan it for ya? As long as it's not over 2 years old, I probably have it. I recall
an exhaust article of some sort. I'm not sure if it's what you're looking for. They did cover some basic ideas. I
had an old copy of Hot Rod magazine doing intake tests(different filter designs on top of a 4 barrel carb). They basically proved that linear flow was absolutely key, even above something that would provide more or easier flow. I saw one of their exhaust articles quite some time back as well where they ran a variety of setups showing that bigger wasn't always better. Ah...lots of neat articles over the years.
Too bad it would be hard as hell to find any of them.